Portable burglar alarm



Feb. 11, 1969 R. w. GREEN 3,427,698

PORTABLE BUHGLAR ALARM Filed Aug. 6, 1965 INVENTOR Robert W. Green ATTORNEY United States Patent O 1 Claim ABSTRACT F THE DISCLOSURE A self-contained portable alarm having power means, alarm means, and switch means within a portable housing, the switch means actuated to close the circuit to the alarm means by an external force on said switch.

This invention relates to portable burglar alarms and has particular reference to one which may be positioned adjacent a door or window and associated therewith in a manner whereby when the door or window is moved, it will actuate a switch, thereby activating the alarm. Obviously the device may actuate a signal light with no noise associated therewith, located remotely from the door or window, or it may actuate a call box in an A.D.T. oiiice, or the like.

The primary object of the invention is in providing a means whereby the alarm, signal, or the like is actuated instantly upon movement of the door or window with which the device is associated.

Adaptations of the device may include carrying the alarm on the person and if bodily attacked, manually operate the switch to actuate the alarm.

Further objects and advantages of the invention will appear in the following description of the invention, one modification of which is shown in the accompanying drawing wherein like reference characters indicate like parts.

Brief description of the drawing:

FIGURE l is a plan view of a portion of wall with a doorway and door therein and having the improved signal device mounted adjacent thereto;

FIGURE 2 is a section on line 2 2 of FIG. 1;

FIGURE 3 is a section on line 3-3 of FIG. 2;

FIGURE 4 is an end view of the device;

FIGURE 5 is a rear end elevation of the switch houslng;

FIGURE 6 is a side elevation of FIG. 5; and

FIGURE 7 is a top plan view of FIG. 6.

Referring now more particularly to the drawings, the signal device is contained within a housing indicated generally at 10, comprising a box-like portion 12 and a cover 14 hinged along one edge to the box portion 12 as at 16. Within the box portion is mounted in any suitable manner adjacent one end thereof the alarm means 18 which may be any form of device for creating a loud obnoxious noise. The end of the box adjacent the alarm 18 is constructed of open mesh grill work to provide the least obstruction to the passage of noise vibrations therethrough. Immediately to the rear of the alarm means 18 is a battery 20 held in place in a spring bracket comprising opposed arms 22-22 which snap around the battery when pressed therebetween. The central positive terminal 23 of the battery abuts and connects with a corresponding terminal of the alarm 18. A spring switch is indicated at 24 and comprises a pair of channel-shaped arms 26-26 which oppose each other and are mounted on an insulated pin 28 extending through the side walls of the channel arms 26. Upon the pin, between the arms, is coiled a spring 30, the ends 32-32 of which bear against opposite ends of the arms 26 to bias them apart. The webs of the channels extend 3,427,608 Patented Feb. 11, 1969 lCC outwardly and are turned backwardly toward each other as indicated at 34-34. The ends of these webs are held apart by a wedge 36 attached to a tether 38. The switch 24 is mounted to the side of the box 10 by insulated mounting means 39. The parts of the switch are insulated from each other as are the ends of the spring 32. A wire 40 from the rear of the battery bracket connects one of the arms 26, and a wire 42 connects one side of the alarm 18 with the other arm 26. Thus when the wedge 36 is removed, the ends 34 spring together and form a contact, closing the circuit from the battery to the alarm and causing it to produce noise until the ends 34-34 are separated again.

The switch 24 is mounted adjacent a corner of the housing 10, in the adjacent end of which is formed an opening 44 through which the wedge 36 may extend to separate the end 34-34 of the webs of the channels. Thus the entire switch mechanism is within the housing of the device.

As will be seen in FIGS. 1 and 2, the housing 10 is mounted adjacent the casing 43 of a door or window, with the end of the tether 38 fastened to the door or window so that when opened it will pull on the tether, thereby removing the wedge 36 and allowing the arms 34-34 to contact each other, consequently closing the circuit to the alarm and causing the obnoxious noise until the parts 34-34 are separated again.`

From the above it is obvious how the device operates. It 'will be apparent too that the device may be connected to any type of alarm means even remotely installed, for example, on the outer wall of a building, a window or door of which is protected by the device.

Having thus described my invention, what I claim and desire to secure by Letters Patent is:

1. A signal device comprising in combination a housing,

means within the housing for holding a battery, a signal or alarm within the housing and having contact with one battery connection, a switch mounted within said housing comprising conductive channel shaped arms, the anges of one channel being parallel to and overlapping the flanges of the other channel and insulated therefrom, the webs of the channels at a first end extending beyond the flanges and bent into the channels and toward the flanges to form contact members, an insulated pivot pin extending through said flanges and pivotally joining the channels intermediate the ends of the channels, a spring mounted on said pivot pin for biasing the webs of the channel members apart at their second end to force said contact members together, one arm connected to said signal device, and the other arm connected to the other battery connection, an opening through the housing proproviding access to the switch arms, insulating means insertable through said opening for holding the arms separated, a tether attached to said means, whereby upon pulling said tether the means is removed allowing the arms to contact each other, thereby closing the circuits to the alarm.

References Cited UNITED STATES PATENTS 1,965,946 7/ 1934 Pincus et al 340-274 2,228,120 1/ 1941 Koehler 340-274 X 3,340,522 9/ 1967 Chick et al. 340-274 2,908,899 10/ 1959 Crafts 340-280 JOHN W. CALDWELL, Primary Examiner. D. L. TRAFT ON, Assistant Examiner.

U.S. Cl. X.R.

ZOO- 61.19, 61.93 

